fix: update wrong indent in content-collections.mdx

[jsparkdev]

Description (required)

• update wrong indent in content-collections.mdx

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Tracked Files

Locale	File	Note
en	guides/content-collections.mdx	Source changed, localizations will be marked as outdated.

Warnings reference

Icon	Description
🔄️	The source for this localization has been updated since the creation of this pull request, make sure all changes in the source have been applied.

[delucis]

Thank you @jsparkdev!